| RefNo | AP/13/14/1 |
| Level | Item |
| Title | Unpublished manuscript, regarding the action of iron on the magnetic needle by John Macdonald |
| Date | 12 January 1829 |
| Description | Macdonald recounts the polarised effect of guns and iron on the magnetic needle in the binnacle on a ship's deck. He provides guidance for navigation at sea with the effect of these iron objects in mind.
Subject: Geodesy
Written by Macdonald in Summerlands, Exeter [Devon, England]. |
| Extent | 41p |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |
| RelatedRecord | AP/13/14 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA3036 | Macdonald; John (1759 - 1831) | 1759 - 1831 |